[issue6827] deepcopy erroneously doesn't call __setstate__ if __getstate__ returns empty dict

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

The documentation of the pickle module doesn't match PEP 307 and the implementation. The copy module was changed in issue25718 to match the implementation of the pickle module. This fixed this issue.

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nosy: +serhiy.storchaka

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<http://bugs.python.org/issue6827>
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